SMA. Automatic Minimum Flow System PN 250-PN 400 ANSI look at info overview. 180 bar < < 400 bar

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1 Automatic Minimum Flow System look at info overview PN 250-PN 400 ANSI bar < < 400 bar 7 V R

2 The Automatic Minimum Flow System SMA 63/64 is a protection device for pump protection. It automatically protects centrifugal pumps from damages, which might occur during operation under low load conditions because of partial evaporation short of a predetermined value, the valve opens its Through actuation of the bypass via a valve control plunger (15) the bypass can be opened resp. closed completely. This ON/OFF -Regulation of the Bypass makes it possible to increase the load limit from 200 bar to 400 bar. The prefered duty is in the range of nominal pressure 250 to 400 bar resp. ANSI 2500 lbs. power. DIN Q Q

3 7 upwards and stops at another predetermined position. During this procedure the cone actuates both control valves of the pilot unit via the lever (32) and the control plunger (31). The Autonomous Minimum Flow Systems comprise a split body with non-return cone, bypass and the pilot unit. In the standard option the casing for valve and bypass are of forged steel Cone seat and actuator control surfaces are stellite-faced. The other parts are made of suitable stainless steels. SMA 63/64 After control valve 2 closes, control valve 1 opens. For the medium the passage to the piston (15) in the bypass becomes free. The piston forces forward closes. (Position OFF ). 100%. downwards and switches the two control valves, as soon as it falls below the required pump minimum This prevents a too fast closing of the bypass and consequently a hammering valve piston (15). By is passed off via the Bypass. A piston (15) takes over the closing and opening of the bypass. Double sealing of the piston in the ring seat (14) achieves extreme durability of the internal bypass parts. The following pressure reduction of the in the bypass. The pilot unit utilizes the medium and the pump pressure for actuation of the piston (15). Two control valves control the pump pressure in front of resp. behind the piston and consequently the position of the piston ON resp. OFF is regulated. The control valves are cone (3) position via the lever (32). With the integrated is achieved. With a pressure indicator on the bypass the function of the Minimum Flow System can be supervised. Through the clear positions of the bypass ( ON resp. protection has been developed, which combines a very low wear and tear with very high operational security at highest pressure loads.

4 As a special design SMA 64 the system can also be utilized for speed controlled pumps. Special attention has been paid to easy maintenance. So it is not necessary to dismantle the bypass wearing parts like piston and ring seat. The hand-operating branch with multi-port throttle manually actuated valve combination. We recommend the branch for sparing of the internal bypass parts at frequent operation in the range of minimum Two positions are possible: D1 in the lower part of the casing with junction below the cone; the bypass remains open D2 in the upper part of the casing with junction above the cone (larger valve length); branch etc. can be provided, if so desired. Flange design acc. to DIN, ANSI, BS, ISO and related standards are possible. We recommend installation directly on the pump installation is from bottom to top, when installed vertically. In order to avoid vibrations in the valve and the pipe lines we recommend to continue the connecting line at the outlet (DN2) and the bypass branch (DN3) for approx. 2-3 m in the chosen nominal bore. A pipe bend directly to the bypass branch should be avoided. AD 2000 and particularly to EN As per Pressure Equipment Directive 97/23 EG the products are provided with the CE marking and the Declaration H1 (Pressure Equipment Directive 97/23 EG) all dangerous material classes of category 1 to 4 are covered. SMA 63/64

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8 Automatic Minimum Flow System SMA 64 for speed controlled pumps

9 7 SMA 64 look at info overview bar PN 250-PN 400 ANSI bar < < 400 bar V R Johannesburg Tel : Fax : sales.jhb@valve.co.za Durban Tel : Fax : sales@valve.co.za